When adding populating pages, it is tricky to find the 'categories' section to add/remove etc.
It's not immediately obvious you need to go back a step to the Joomla 'Admin' console.
This is especially true as when on the left there are options which you would less regularly use:
/index.php?option=com_sppagebuilder&view=dashboard&tmpl=component#/
:)
